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McFadden D, Pasanen EG.McFadden D, et al. Among authors: pasanen eg.Proc Natl Acad Sci U S A. 1998 Mar 3;95(5):2709-13. doi: 10.1073/pnas.95.5.2709.Proc Natl Acad Sci U S A. 1998.PMID: 9482952Free PMC article.